Rear Cone

Rear Cone for Agricultural Machinery - Technical Specification & Manufacturing Description

1. General Information

Industry Sector: Agricultural Machinery

Component Name: Rear Cone

Manufacturing Process: CNC Metal Spinning

Structural Type: Axisymmetric conical shell, seamless, cold-formed

Base Material: Q235B Carbon Structural Steel, compliant with GB/T 700-2006 (Equivalent to EN S235JR / ASTM A36 for reference)

2. Material Specifications

Mechanical Properties (Typical):

• Yield Strength (Rp0.2): ≥235 MPa
• Tensile Strength (Rm): 370–500 MPa
• Elongation (A): ≥26%
• Density: 7.85 g/cm³

Material Condition:
Hot-rolled steel plate, suitable for cold plastic deformation by multi-pass spinning without cracking or delamination.

3. Dimensional Specifications

Nominal Dimensions:

• Outside Diameter: Ø625 mm
• Height: 171 mm

Wall Thickness:

• Nominal: 4.0 mm
• Thickness Tolerance: ±0.15 mm

Geometric Tolerances:

• General tolerance: GB/T 1804-2000, grade m
• Roundness: ≤0.3 mm
• Perpendicularity: ≤0.2 mm/m

Surface Roughness:

• As-spun surface: Ra ≤1.6 μm

Surface Condition:
No coating applied; metallic surface maintained after spinning and deburring.

4. Manufacturing Process Description

4.1 Primary Forming Process

Process Type:
CNC Metal Spinning (Incremental, multi-pass forming)

Machine Tool:
CNC Metal Spinning Lathe – Model CNC1250

Key Process Parameters:

• Spindle Speed: 500–900 rpm
• Roller Feed Rate: 4–8 mm/s
• Single-Pass Thickness Reduction: 0.8–1.2 mm
• Total Controlled Deformation: 3.8–4.2 mm

Process parameters are selected to ensure stable material flow, controlled strain distribution, and prevention of wrinkling or thinning failure.

4.2 Auxiliary Operations

Process sequence:
Raw material degreasing → Plate leveling (flatness ≤0.2 mm/m) → CNC spinning forming → Mechanical deburring (3,000 rpm) → Compressed air cleaning → Final dimensional inspection

Edge Treatment:
All edges chamfered; minimum chamfer radius R ≥1.5 mm to eliminate sharp edges and stress concentration.

5. Quality Assurance & Inspection

Quality System:
ISO 9001:2015 certified manufacturing and inspection system.

5.1 Incoming Material Inspection

• Optical emission spectrometry (C ≤0.22%, Mn ≤1.40%, elemental deviation ≤±0.05%)
• Mechanical property verification
• Ultrasonic testing to confirm absence of internal defects

5.2 In-Process Control

• Spinning conformity ≥98%
• Dimensional verification using CMM
• Full-circumference wall thickness inspection via ultrasonic thickness gauge (accuracy ±0.01 mm)
• Visual and tactile inspection for surface defects, laps, or cracks

5.3 Final Inspection

Sampling inspection per GB/T 2828.1-2012 (AQL 2.5), covering:

• Dimensional accuracy
• Geometric tolerances
• Surface integrity and edge quality

Each qualified component is supplied with inspection records and traceability identification.

6. Production Capacity & Logistics

Manufacturing Capacity:

• Daily output: approx. 50 units
• Monthly capacity: approx. 1,500 units
• Parallel production supported by multiple CNC spinning machines

Lead Time:

• Standard orders: 5–8 working days
• Batch orders (≥100 units): 8–12 working days
• Expedited orders: 3–5 working days (subject to capacity allocation)

Packaging:
Rust-preventive paper + EPE foam + carton + wooden pallet (20 units per pallet)

Delivery:
Domestic door-to-door logistics within 3–6 working days
On-site delivery to agricultural machinery manufacturers available with prior scheduling.

7. Application & Operating Conditions

Primary Application:
Rear-end structural and functional component for agricultural machinery such as tractors, combine harvesters, and grain drying systems. The cone structure provides material guidance, mechanical protection, and noise attenuation during operation.

Operating Environment:

• Temperature range: −20°C to +120°C
• Suitable for dusty, humid, and high-vibration field conditions
• Rated load pressure: ≤1.0 MPa
• Designed to withstand impact and cyclic loads typical of agricultural operations

8. Extended Industrial Applications

Applicable as material guide cones or protective housings in forestry machinery (wood chippers, log processors), mining equipment (light-duty conveyors), and construction waste handling systems. The component benefits from the strength, formability, and cost efficiency of Q235B carbon steel for high-impact, high-dust environments.

9. After-Sales & Technical Support

Warranty Period:
18 months against manufacturing defects including dimensional deviation, material non-conformance, forming defects, or structural failure.

Technical Support:

• Application and selection consultation
• Installation documentation and dimensional drawings
• Material certificates and inspection reports
• Remote installation and integration support (video/phone)

Service Response:
Customer inquiries acknowledged within 24 hours. Corrective actions provided within 1–3 working days with dedicated follow-up.

Post-Warranty Services:
Paid repair, re-welding, dimensional correction, and refurbishment services available. Long-term maintenance and inspection agreements can be arranged for OEM customers.

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